Wykonaj mnożenie i zredukuj wyrazy podobne.
a)x(b+1) + x
b) - a(3-b) + 3a
c) - a (a - 5b + 7) - ab
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a)x(b+1) + x = bx + x + x = bx + 2x
b) - a(3-b) + 3a = -3a + ab + 3a = ab
c) - a (a - 5b + 7) - ab = -a²+5ab-7a-ab = -a²+4ab-7a
a)
x(b+1) + x=
xb+x+x=
2x+xb
b)
-a(3-b) + 3a=
-3a + ab + 3a =
ab
c)
-a (a - 5b + 7) - ab=
-a²+5ab-7a-ab =
-a²+4ab-7a